Taking total germinal cell survival after irradiation in the rat as a biological criterion, RBE’s coefficients were determined in mixed fields (neutron + gamma) for various ratios of neutron/gamma doses. Numerical values can reach 1 0 for low dose levels (1 -3 dGy).

It can be concluded that the biological effects of gamma rays and neutrons seem to be independent : RBE’s values do not depend upon the neutron/gamma ratio ; thus, in mixed fields, they correspond to the neutron dose only.

These experimental results show that in mixed field irradiations of large animals, the high RBE values might make up for the gradient of neutron dose which exists inside the body. Experiments are being made to check this assumption.

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